To:sot_shift
from: Dan Schwartz
date: 11 Aug 99, 06:00am EDT
Subject: SOT shift report, Shift H20
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_10_1999_H.txt.

Shift H20.  (A20) 
	Start at 223:02:00  GMT
		 = 10:00pm 10 Aug EDT
	End	   06:00am 11 Aug
   
SOT Lead	DAS
Spac/Aspect	RAC
FOT/Sci liason	
HRC		GA 
ACIS 		

(Times will be given in GMT on day 223. In general
times are rough, not precise.)

PLAN
Perform SSR playback. (DONE)
Perform Earth Sensor scan.
Survive 5+ hours without ground communication. (DONE)

EVENTS
Yaw and pitch maneuvers for earth sensor scan. Scan 24
to be done while out of communication.

At start of shift, 02:00, we finish the last ACIS orbital background
measurement. OBSID 62704. We continue in format 2.


RADMON is enabled, and the EPHIN did trigger the SCS 85
for HRC high voltage.  Leads to a non-fatal errror every
ephin cycle (2mFrames, 65sec). 
Disable RADMON at 03:40.

OBSID 62476 commanded at 04:00

Start SSR playback 02:47.  Get a large number of errors, restart
at 02:53. Finish playback at 03:45.

Sent CAP 129 to reset fid lights. 03:50.

Go LOS at 04:21. AOS at 09:20

09:30 start pitch maneuver to sun point.

NOTES/ISSUES/PROBLEMS
OBSID look-ahead:
   OBSID 62744 is to be used during the ACC opening process
   OBSID 62743 and 62742 are reserved for use during the FCM
	measurements. If we need more OBSID's for this
	measurement go to 62738 and then 62732. (Do NOT
	use OBSID 62741, 62740, or other 6273n numbers, as
	they were previously used.)
   OBSID 62948, which I believe is previously unused, is designated
	for the next attempt at HRC HV manual ramp up. This 
	opportunity is next allowed to be at 20:00 GMT on Wednesday.
	SSM will decide if that is appropriate for an actual
	ramp-up. 

In order to maintain configuration control for ACA software Rob
has defined the following procedure:
"The SOT spacecraft/aspect scientist, when running CAP 91A or 129, 
should coordinate with the SOT manager to run the command
/proj/rad1/ska/perl/aca8x8 
on a HEAD computer (the SOT manager workstation for example). 
This will send email to the SMF, giving the name of the command upload, 
and the GMT time it was issued."

We defined a policy to exclude any information regarding CHandra
performance from these reports, for the period subsequent to 
SSD opening until NASA Headquarters releases the information
officially.  This allows us to continue emailing these shift
reports to the current distribution, and to post them to the web.

We stayed in format 2 throughout the earth scan 24, therefore all that
data is lost. This decreases our estimated attitude knowledge upon 
opening SSD to be 5 deg in the line perpendicular to the sun.
-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   
pager: 800-759-8352 PIN 1636502
       or e-mail 1636502@skytel.com 
-------------------------------------------------------